Although the words “premonition” and “foreboding” have similar meanings, they are different because

I believe it is “they have distinct connotations”

i would pick a. i think this is more of a personal question though.

remember, the goal of an adjective clause is to add more information to a noun or a pronoun. as you can see from the examples above, you can add information by including a longer adjective clause or tighten up a sentence by turning the adjective clause into an adjective phrase.